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<TITLE>80386 Programmer's Reference Manual -- Opcode NOT</TITLE>
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<H1>NOT -- One's Complement Negation</H1>

<PRE>
Opcode    Instruction   Clocks    Description

F6   /2   NOT r/m8       2/6      Reverse each bit of r/m byte
F7   /2   NOT r/m16      2/6      Reverse each bit of r/m word
F7   /2   NOT r/m32      2/6      Reverse each bit of r/m dword
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<H2>Operation</H2>

<PRE>
r/m := NOT r/m;
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<H2>Description</H2>

NOT inverts the operand; every 1 becomes a 0, and vice versa.

<H2>Flags Affected</H2>

None

<H2>Protected Mode Exceptions</H2>

#GP(0) if the result is in a nonwritable segment; #GP(0) for an illegal
memory operand effective address in the CS, DS, ES, FS, or GS
segments; #SS(0) for an illegal address in the SS segment; #PF(fault-code)
for a page fault

<H2>Real Address Mode Exceptions</H2>

Interrupt 13 if any part of the operand would lie outside of the effective
address space from 0 to 0FFFFH

<H2>Virtual 8086 Mode Exceptions</H2>

Same exceptions as in real-address mode; #PF(fault-code) for a page
fault


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<B>up:</B> <A HREF="c17.htm">
Chapter 17 -- 80386 Instruction Set</A><BR>
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